用于防止子元素继承父样式的CSS [重复]

Possible Duplicate:
How do I prevent CSS inheritance?

可能重复：如何防止CSS继承？

Is there a way to declare the CSS property of an element such that it will not affect any of its children or is there a way to declare CSS of an element to implement just the style specified and not inherit any of the style declared for its parents?

有没有办法声明元素的CSS属性，使其不会影响它的任何子元素，或者是否有办法声明元素的CSS只实现指定的样式，而不是继承为其父元素声明的任何样式？

A quick example

一个简单的例子

HTML:

HTML：

<body>
    <div id='container'>
        <form>
            <div class='sub'>
                Content of the paragraph
                <div class='content'>Content of the span</div>
            </div>
        </form>
    </div>
</body>

CSS:

CSS：

form div {
    font-size: 12px;
    font-weight: bold;
}
div.content {
    /* Can anything go here? */
}

Under normal circumstances one would expect the The text block "Content of the paragraph" and "Content of the span" will both be 12px and bold.

在正常情况下，人们会期望文本块“段落的内容”和“跨度的内容”都是12px和粗体。

Is there a property to include in the CSS above in the "div.content" block that will prevent it from inheriting the declaration in the "#container form div" block to limit the style to just "content of the paragraph" and spare "Content of the span" including any other children div?

是否有一个属性包含在上面的CSS中的“div.content”块中，这将阻止它继承“#container form div”块中的声明，以将样式限制为“段落的内容”并且备用“跨度的内容“包括任何其他儿童div？

If you are wondering why, well, I created a particular CSS file that gives all the forms on my project a particular feel and the divs under the form all inherit the feel. No problem. But inside the the form I want to use Flexigrid but flexigrid inherits the style and it just looks useless. If I use flexigrid outside the form and such it won't inherit the forms css, then it looks great. Otherwise it just looks terrible.

如果你想知道为什么，好吧，我创建了一个特定的CSS文件，它给我项目中的所有表单一个特别的感觉，并且表单下的div都继承了这种感觉。没问题。但是在我希望使用Flexigrid的形式内部，但flexigrid继承了样式，它看起来没用。如果我在表单之外使用flexigrid并且它不会继承表单css，那么它看起来很棒。否则它看起来很糟糕。

3 个解决方案

#1

Unfortunately, you're out of luck here.

不幸的是，你在这里运气不好。

There is inherit to copy a certain value from a parent to its children, but there is no property the other way round (which would involve another selector to decide which style to revert).

有一个继承可以将某个值从父项复制到它的子项，但是没有相反的属性（这将涉及另一个选择器来决定要还原哪个样式）。

You will have to revert style changes manually:

您必须手动还原样式更改：

div { color: green; }

form div { color: red; }

form div div.content { color: green; }

If you have access to the markup, you can add several classes to style precisely what you need:

如果您可以访问标记，则可以添加几个类来精确设置您需要的样式：

form div.sub { color: red; }

form div div.content { /* remains green */ }

Edit: The CSS Working Group is up to something:

编辑：CSS工作组取决于：

div.content {
  all: revert;
}

No idea, when or if ever this will be implemented by browsers.

不知道，何时或是否会由浏览器实现。

Edit 2: As of March 2015 all modern browsers but Safari and IE/Edge have implemented it: https://twitter.com/LeaVerou/status/577390241763467264 (thanks, @Lea Verou!)

编辑2：截至2015年3月所有现代浏览器，但Safari和IE / Edge已实现它：https：//twitter.com/LeaVerou/status/577390241763467264（谢谢，@ Lea Verou！）

Edit 3: default was renamed to revert.

编辑3：默认重命名为还原。

#2

Can't you style the forms themselves? Then, style the divs accordingly.

你不能自己设计表格吗？然后，相应地设置div的样式。

form
{
    /* styles */
}

You can always overrule inherited styles by making it important:

您可以通过使重要的方式取代继承的样式：

form
{
    /* styles */ !important
}

#3

CSS rules are inherited by default - hence the "cascading" name. To get what you want you need to use !important:

CSS规则默认继承 - 因此是“级联”名称。要得到你想要的东西，你需要使用！重要的是：

form div
{
    font-size: 12px;
    font-weight: bold;
}

div.content
{
    // any rule you want here, followed by !important
}

#1